Weather in Ontario, California
Wednesday 18 November 2026
19°
Few clouds
Feels like 18°
- High
- 20°
- Low
- 14°
- Humidity
- 38%
- Wind
- 11 km/h
Temperature and rain / Ontario
The coming days
High
24°
Low
11°
Average high
20.5°
Average low
14.2°
Total rain
23.5 mm
Average rain
1.6 mm
Air quality - Ontario
Particles and ozone
Good
2.40 µg/m³
0-1212-3535-5555+
The air is clean: enjoy the outdoors.
PM103.00µg/m³
Ozone75µg/m³
Data updated hourly
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Frequently asked questions
Quick answers about the weather in Ontario
Tomorrow in Ontario, expect Scattered clouds ⛅, with:\n\n- High of 19°\n- Low of 12°
Need more information?
Our data is updated regularly to give you the most reliable forecast.
Last updated: 2026-11-14